2112120021 has 16 divisors (see below), whose sum is σ = 3073195008. Its totient is φ = 1279647600.

The previous prime is 2112120019. The next prime is 2112120037. The reversal of 2112120021 is 1200212112.

It is not a de Polignac number, because 2112120021 - 2¹ = 2112120019 is a prime.

It is a super-2 number, since 2×2112120021² = 8922101966218080882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2112119979 and 2112120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112120091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111010 + ... + 128636.

It is an arithmetic number, because the mean of its divisors is an integer number (192074688).

Almost surely, 2^2112120021 is an apocalyptic number.

It is an amenable number.

2112120021 is a deficient number, since it is larger than the sum of its proper divisors (961074987).

2112120021 is a wasteful number, since it uses less digits than its factorization.

2112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21272.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2112120021 is about 45957.8069646497. The cubic root of 2112120021 is about 1283.0380352929.

Adding to 2112120021 its reverse (1200212112), we get a palindrome (3312332133).

It can be divided in two parts, 2112 and 120021, that multiplied together give a palindrome (253484352).

The spelling of 2112120021 in words is "two billion, one hundred twelve million, one hundred twenty thousand, twenty-one".